中红外驻波V型腔衰荡^(14)CO_(2)光谱检测  

Mid-infrared standing wave V-cavity ring-down^(14)CO_(2)spectral detection

作　　者：张洪炜 赵刚[1,2] 朱炳弛 焦康 朱地 史哲 杨天悦 闫晓娟 杨家琪[1,2] 马维光 贾锁堂 ZHANG Hongwei;ZHAO Gang;ZHU Bingchi;JIAO Kang;ZHU Di;SHI Zhe;YANG Tianyue;YAN Xiaojuan;YANG Jiaqi;MA Weiguang;JIA Suotang(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China;Energy Research Institute,Qilu University of Technology(Shandong Academy of Science),Jinan 250013,China;Suzhou Grand Energy Technology Co.,Ltd,Suzhou 215011,China)

机构地区：[1]山西大学激光光谱研究所量子光学与光量子器件国家重点实验室,山西太原030006 [2]山西大学极端光学协同创新中心,山西太原030006 [3]齐鲁工业大学(山东省科学院)能源研究所,山东济南250013 [4]苏州冠德能源科技有限公司,江苏苏州215011

出　　处：《光学精密工程》2025年第3期359-366,共8页Optics and Precision Engineering

基　　金：国家重点研发计划资助项目(No.2022YFC3703900,No.2023YFF0614000);国家自然科学基金资助项目(No.62327813,No.62175139,No.62375161,No.61975103);山西省留学人员科技活动择优资助项目(No.20220001);江淮前沿技术协同创新中心追梦基金课题资助(No.2023-ZM01C007)。

摘　　要：针对核设施对气态污染物高灵敏检测的需求,提出了一种基于驻波V型腔衰荡吸收光谱的^(14)CO_(2)检测技术,结合量子级联激光器,搭建了一套中红外吸收光谱检测系统,实现了对^(14)CO_(2)气体的高灵敏检测。系统采用由三个高反镜组成的驻波V型腔,在不增加光学腔物理长度的情况下将光谱分辨率提升一倍。通过台阶式扫描激光波长从而依次触发相邻腔模的衰荡事件,在实现对完整分子光谱测量的同时,保证了腔衰荡光谱信号的信噪比。为了避免由于腔长和激光频率漂移造成的触发位置变化,实验中对台阶电压值进行了动态修正,从而实现了对^(14)CO_(2)光谱的长期稳定测量。通过Allan方差分析,得到该系统的探测极限为2.5×10^(-10)cm^(-1),最小可探测^(14)CO_(2)浓度为1.2×10^(-12)。这项技术可用于监测核电站废气中的放射性二氧化碳排放。To address the pressing need for highly sensitive detection of gaseous pollutants in nuclear facili⁃ties,a detection technique employing cavity-enhanced absorption spectroscopy of^(14)CO_(2)was developed.This method incorporates a standing wave V-shaped cavity alongside a quantum cascade laser.A mid-in⁃frared absorption spectroscopy detection system was constructed,successfully achieving highly sensitive detection of^(14)CO_(2)gas.The system utilizes a standing wave V-shaped cavity comprising three high-reflec⁃tance mirrors,which effectively doubles the spectral resolution without necessitating an increase in the physical length of the optical cavity.By incrementally scanning the laser wavelength to sequentially pro⁃voke the absorption events of adjacent cavity modes,comprehensive molecular spectral measurements are obtained while maintaining a high signal-to-noise ratio of cavity absorption spectroscopy signals.Further⁃more,to mitigate variations in trigger positions caused by fluctuations in cavity length and laser frequency drift,dynamic correction of the step voltage values was implemented during the experiment,resulting in long-term stability of^(14)CO_(2)spectral measurements.Allan variance analysis revealed that the detection lim⁃it of this system is 2.5×10^(-10)cm^(-1),corresponding to a minimum detectable concentration of 1.2×10^(-12)for^(14)CO_(2).This technology holds significant promise for monitoring the emission of radioactive carbon diox⁃ide in the exhaust gases from nuclear power plants.

关 键 词：光谱检测 激光吸收光谱 腔衰荡光谱 放射性二氧化碳 

分 类 号：O439[机械工程—光学工程]